Add WPTs that RTCStats.timestamp is expressed in "Performance time". #48361
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
For w3c/webrtc-pc#3005 Sadly Date.now() and performance.timeOrigin + performance.now() only diverge in edge cases (e.g. laptop going to sleep or wall clock changing while web page is still open?) so these WPTs may give false positives to Wall Clock implementations, but they will at least fail if clock is completely off and document correct behavior. The current implementation is wrong, but we still pass the test because of no divergence here. We need to exclude Windows at the moment though because some of its clocks has precision limitations (example: [1]) and there seems to be some mismatch between WebRTC's current clock impl and Performance that becomes visible in this WPT (just a few ms delta). [1] https://source.chromium.org/chromium/chromium/src/+/main:base/time/time.h;l=1180;drc=1a6106ec2fc932237359fe1f54334a66bc4886f1 Bug: chromium:369369568 Change-Id: Iad452519800aa4c41427317d29e4fb11235b2f37 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5887191 Commit-Queue: Henrik Boström <hbos@chromium.org> Reviewed-by: Harald Alvestrand <hta@chromium.org> Cr-Commit-Position: refs/heads/main@{#1361140}
wpt-pr-bot
approved these changes
Sep 27, 2024
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
For w3c/webrtc-pc#3005
Sadly Date.now() and performance.timeOrigin + performance.now() only
diverge in edge cases (e.g. laptop going to sleep or wall clock
changing while web page is still open?) so these WPTs may give false
positives to Wall Clock implementations, but they will at least
fail if clock is completely off and document correct behavior.
The current implementation is wrong, but we still pass the test because
of no divergence here. We need to exclude Windows at the moment though
because some of its clocks has precision limitations (example: [1]) and
there seems to be some mismatch between WebRTC's current clock impl and
Performance that becomes visible in this WPT (just a few ms delta).
[1] https://source.chromium.org/chromium/chromium/src/+/main:base/time/time.h;l=1180;drc=1a6106ec2fc932237359fe1f54334a66bc4886f1
Bug: chromium:369369568
Change-Id: Iad452519800aa4c41427317d29e4fb11235b2f37
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5887191
Commit-Queue: Henrik Boström <hbos@chromium.org>
Reviewed-by: Harald Alvestrand <hta@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1361140}